Go Back  Miata Turbo Forum - Boost cars, acquire cats. > Performance & Tuning > ECUs and Tuning
Reload this Page >

Just installed MS3, Tunerstudio isn't reading AFR

ECUs and Tuning Discuss Engine Management, Tuning, & Programming
Sponsored by:
Sponsored by:

Just installed MS3, Tunerstudio isn't reading AFR

 
Old 03-18-2017, 02:18 PM
  #1  
Newb
Thread Starter
 
Join Date: Sep 2015
Location: Winston Salem, NC
Posts: 43
Total Cats: 2
Unhappy Just installed MS3, Tunerstudio isn't reading AFR

I just installed my Reverant MS3 basic for my 05 Miata, and Tunerstudio isn't reading the AFR. I have an Innovate MTX-L, with the yellow wire connected to the factory o2 sensor location on the harness. The wideband is grounded with the engine ground. The Megasquirt is directly plugged in to the factory harness, vacuum line ran to the intake manifold, etc. I setup a new project in Tunerstudio with the instructions provided, and it seemed to work fine. I started the car and noticed that the AFR gauge in Tunerstudio was stuck on 7.90 with the needle twitching, while the car was idling at around 17, to which promptly shut the engine off. I know the Innovate MTX-L works because I previously had it wired to the factory harness/ECU with the brown narrowband and the gauge showed the wideband reading. Also, I checked the yellow wire with a multimeter with the car of, and it read 5v, which is correct because the AFR was 22.4. I've searched several forums and posts and I can't seem to find anyone who has experienced this. I've already tried calibrating the AFR (setting up a custom linear wideband with 0v 7.35 and 5v 22.39. In reality, I'm probably missing something really simple.... Any help would be greatly appreciated. Thanks in advance!
Blayton is offline  
Old 03-19-2017, 01:30 PM
  #2  
Supporting Vendor
iTrader: (10)
 
Reverant's Avatar
 
Join Date: Jun 2006
Location: Athens, Greece
Posts: 5,584
Total Cats: 240
Default

The instructions included with the unit specify that you need to connect the wideband's output to the yellow wire on the DB37, not to the factory O2 wire.
__________________
Originally Posted by ninerwfo View Post
The “into to megasquirt thread” mentions that the MS3 basic has 5 inputs with built in pull up resistors - and I was just wondering why it would have so many, while the MS3Pro PnP has just 2 (with no pull ups?)
MS Labs: Plug and Play Megasquirt ECUs for ANY 90-05 Miata (NA, NB1, NB2 w/VVT, MSM), including basemaps to get you started ASAP. PM me or email or details.
For support on MS Labs ECUs: Please email, be sure to include the unit's serial number and include a datalog and your current map.
Reverant is offline  
Old 03-19-2017, 01:40 PM
  #3  
Newb
Thread Starter
 
Join Date: Sep 2015
Location: Winston Salem, NC
Posts: 43
Total Cats: 2
Default

Originally Posted by Reverant View Post
The instructions included with the unit specify that you need to connect the wideband's output to the yellow wire on the DB37, not to the factory O2 wire.
Yea, I figured it out about 5 minutes after I posted this thread. I should've posted saying so haha... I guess I was under the impression that the pigtail was completely optional due to the factory harness plug. Anyways, thank you very much Reverant! My car's been running perfectly, I drove around a few hours last night with VEAL, and have a pretty spot on tune already.
Blayton is offline  
Old 03-10-2019, 03:22 PM
  #4  
Newb
 
Join Date: Mar 2019
Posts: 1
Total Cats: 0
Default

My miata is doing the same thing. MS3 pnp pro with mtx-L. I have my wideband output plugged into options pin "C". Is this not correct?
MotoMiata is offline  
 


Thread Tools
Search this Thread

Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.